297TroubleshootingWhite lines down the page• Make sure foreign material such as a torn piece of paper, sticky notes or dust is notinside the machine and around the toner cartridge and drum unit.• The toner cartridge may be damaged.Replace the toner cartridge with a new toner cartridge.• The drum unit may be damaged.Replace the drum unit with a new drum unit.Image skewed• Make sure the paper or other print media is loaded correctly in the paper tray andthe guides are not too tight or too loose against the paper stack.• Set the paper guides correctly.• The paper tray may be too full.• Check the paper type and quality.• Check for loose objects such as torn paper inside the machine.• (For automatic 2-sided printing models)If the problem only occurs during 2-sided printing, check for torn paper in the2-sided tray, verify the 2-sided tray is inserted completely and the back cover isclosed completely.Curled or wavy• Check the paper type and quality. High temperatures and high humidity will causepaper to curl.• If you do not use the machine often, the paper may have been in the paper tray toolong. Turn over the stack of paper in the paper tray. Also, fan the paper stack, andthen rotate the paper 180° in the paper tray.• Open the back cover (face-up output tray) to let the printed paper exit onto theface-up output tray.• Choose Reduce Paper Curl mode in the printer driver when you do not use ourrecommended print media.Wrinkles or creases• Make sure paper is loaded correctly.• Check the paper type and quality.• Turn over the stack of paper in the tray or rotate the paper 180° in the input tray.
